The Supreme Court today held the formal Investiture Ceremony for Associate Justice Elena Kagan, the 100th Associate Justice to join the Court. According to the Court's web-site:

During this special sitting of the Supreme Court, Justice Kagan took the Judicial Oath of Office for a second time. Before the ceremony, the Justices along with President Obama gathered in the Justices' Conference Room. Following the Courtroom ceremony, Chief Justice Roberts escorted Justice Kagan down the front steps of the building for a brief photo opportunity with the press.

On August 7, 2010, Elena Kagan was sworn in as the 100th Associate Justice in a private ceremony at the Supreme Court so she could begin to participate in the work of the Court.

The Court, of course, opens its new term on Monday. The American Constitution Society hosted its OT 2010 preview here; the Federalist Society hosted its preview here.